Improvement in balance-scales



nitrd gitanas parte eine.

GEORGE W'.- CHANDLER, OF'FITCHBURG, ASSIGNOR TO HIMSELF AND JOHN G. FOL- SOM, OF WINCHENDON, MASSACHUSETTS.

Letters .Patent No. 93,054, flrttell Ju'ly'i, 1869.

mizovnmnr IN BALANCE-scams.

The Schedule-referred to in these Letters Patent and making part ol' the same.

Know all men by these presents:

That I, GEORGE W. CHANDLER, of Fitchburg, in the county of XVorcester, and Commonwealth of Mas sachusetts, have invented certainnew and useful Improvexnents in Balance-Scales; and I do hereby deelarel that the following is a full, clear, and exact description of the same,.rel'ereuce being had to the accompanying drawings, forming a part of this specilication, in which- Figure 1 represents a side view ofmy improved balance-scale, and l 1 Figure 2 represents a pian or top view ot' the same.

To enable those skilled in the art to which my inventioir belongs, to make and use the same, I will describe it more in detail.

In the drawings, the pzut marked- A is the frame,

the base B of which is cast hollow or open on thelnwer side, while .the upright post C is also cast hol-v low, as Aindicated in the drawings by dotted and broken lines. l

The pan or receptacle D, in which the articles to be weighed are placed, is supported on the forked stand E, which, in turn, is supported on the upper end of rod F, the lowerend of which is provided with4 a screw-thread, to receive the thread of the joint-piece a, which is hinged to the adj usting-nut piece b, through which the rear end of the rod G- passes or is screwed, the-iront end of rod G vbeing held in place by the pin or pivot r1. Y n

The upper en d of rod F is provided with a neck piece, H, iz: which are secured the pivots or knifeedges c which pass through holes in the rear ends I 1 nf the beam J, which is supported in the curved stumm-fis. li K ofthe cap-piece L, fastened to the top oi' the upright part G of frame A.

The front of he-.nn J is hinged to the upper end of rod M, the lou-er end of which rod is hinged to the knife-edged lever-piece N, the front end 'of which is hinged between the stands ce, on top of the front post Q of frame A, all as fully indicated in the drawings.

P is .the balance-weight, suspended to the front end of lever Q, the rear end ofwhich is hinged between ear-pieces fl f, fastened to the upright post O. The under side of the lever Q is smooth, and curved to correspond with the curved knife-edge g of the piece N, but wide enough to render the slipping laterally of the edge of lever N from its surface impossible.

R is the index-plate, the lower` end of which is fastened to the front of frame A, while the upper curved endis graduated, to indicate the 'weight ofthe article being4 weighed.

, It Will be seen that ass-the arm or lever Q is raised,-

as indicated in red lines, fig. 1, by thearticle lplaced in the receptacle D, its leverage or resistance is greatly increased.

It will be understood that different weights can be 'l added to the balance-weight P, thesame asin the use and lever-scales,

` As the front end of rod G is held from'turning, by means ofthe pin d, there is no liability of nut b working out of place, and yet it can be readily adjusted by simply removing pin d and turning rod G.

Having described my improved balance-scale,

. What I claim therein as new and' of my invention, l

and desire tosecure by Letters Patent, is-

1. The combination of the knife-edged lever N with the smooth-faced lever Q, for varying the leverage of a. balancescale, substantially as set forth.

2. The combination, with -rods F and G, and frame A, of the joint-pieces a b and pind, substantially as and for the purposes set forth.

v GEO. W. CHANDLER.A Witnesses:

THos. H. Dones, I). L. MILLER. 

